ios - 超过 1 个 UIPickerView Swift

Question

我试图用 2 个 UIPickerView 制作一个简单的应用程序，当我放入第二个时，它只包含与第一个相同的数据。我已经声明了将数据插入第一个函数的函数:

var typesOfData = ["KB","MB","GB"]
func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
    return 1
}

func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
    return typesOfData.count
}

func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String! {
    return typesOfData[row]
}

但我需要知道如何为第二个 UIPickerView 声明这些函数。

Answer 1

您可以使用相同的委托(delegate)方法来填充两个 UIPickerView。只需根据您正在处理的 UIPickerView 有条件地填充它们。例如，如果您的第一个 UIPickerView 名为 firstPickerView，而您的第二个 UIPickerView 由 secondDataSet 填充:

var typesOfData = ["KB","MB","GB"]
var secondDataSet = ["A","B","C"]
func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
    return 1
}

func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
    if pickerView == firstPickerView {
        return typesOfData.count
    } else { // if it's the second picker view
        return secondDataSet.count
    }
}

func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String! {
    if pickerView == firstPickerView {
        return typesOfData[row]
    } else {
        return secondDataSet[row]
    }
}